Grinding or crushing machinery.



A. H. MOSS.

GRINDING OR CRUSHING MACHINERY.

APPLICATION FILED FEB- 8, I9I5.

PatentedSept. 21, 1915.

3 SHEETSSHEET I.

COLUMBIA PLANOGRAPH CO.,\VASHINGTON. D. c,

A. H. MOSS.

GRINDING 0R CRUSHING MACHINERY.

APPLICATION FILED FEB. 13. 1915.

1 1 54,532. Patented Sept. 21, 1915.

3 SHEETS-SHEET Z.

A. H. MOSS.

GRINDING 0R GRUSHING MACHINERY.

APPLICATION FILED FEB. s. 1915.

Patented Sept. 21, 1915.

3 SHEETS-SHEET 3.

unrrn er TESFATENT Ringgit;

ARTHUR HAREIMAN nose, or ivcrs'rnnroiv; "GAINs'BonouGH, ENGLAND."

eamnnveoR-"eacssnve ivrzroriIivERY.

Specifieationof Letters Patent? Pgitented'sptgi;1915.

'- Application filed Febr uary 8, 1915;: Serial No. 6,834.

To all whom it may concern Be it known that I, ARTHUR HARRIMAN This invention relates to grinding nor is crushing machinery of the kind in lwhich-r rollers on swiveling shaftsworlr inva hol low faced horizontal rotating ring towiichthey may be pressed byspringsior weights,-

the object of the invention being to provide improvements in the construction and opcration whereby a s1n1-p'le-mach1ne--ofgreats efliciencyis provided, :which maybe-com liver-it at the desired degree of-finenessi In the accompanying drawingsc-Figure- 1 is a sectional elevation of a grinding'lma-s chine according tothis -1nvent1on;i Figm2 throughout the drawings:

In carrying out this invention a grinding ring 1 is mounted in a horizontal position on threeormore supporting rollers 2, (of which only oneis shown in Fig.1 of'the drawings). The upper face of the grind ing ring 1 is concave or hollow, as shown, and one 0r more, but conveniently four,

grinding rollers 8 rest in this concave'fa'cew The rollers 3- are rotatably'mountedon swiveling shafts 4: which arepreferably-disposed radially in'relation to the-ring'l, althoughv theposition of the shafts-at and the shapeiof the-rollers8 may be varied a ccordingtowre quirementsz The shafts 4 are :pivoted at ":5

to a central pedestal E 6 to-provide it'he "re t quired swiveling thereofto enable the'grind 1 ing rollers to ride :over' the material to be ground, which is fed into the: hollow upper face of the grinding ring v1;

The grinding surfaces of the ring *1 and of the rollers 3 may be 'renewa'ble' 'by any convenient construction, such asthat indicated in thedrawmgs.

One of the supporting'rollersQ is driven by a pulley 7 on its shaft-8 and thus the ring 1 will becaused to rotate,-thegrinding roll er-s3 also revolving by frictional contact -with the ring or its contents. If desiredone. .1 of the-grinding rollers 3 may-be positively driven from-the driven supporting roller sha-ft= 8 Any-suitabledriwing means, such as belts, gear wheels, etc.,- may be employed to connectone of the rollers 3 with the shaft -fitted-with means for driving a grinding rolleri 3 on that side, which would 0on P veniently be disposed above the extended shaft 8. 'Th us the grinding roller maybe binecbwith a pneumatic separator, so ithat the one. machine will grind material andv de-= driven-by an un'crossed-belt, or a chain drive illustrated" respectively -on the extended shaft 8 and on-the grinding'roller ii above it. The 1 drawings show a construction in "whichzfour ofv the grinding rollers 3 are prd is a sectionalelevation of a slightly vm'odi fied'for'm of the invention;=-Fig.-3 is aplan, the 'upper portion' being removed, of ville-.1 embodimentzof the invention shown in Flg.'=n. 2; Fig.4 is a horizontal sectionsubstantially onthelinelof-Fig.'1;:Fig. 5 is a detail: view.-

Like reference figures indicate like' parts videdfalthoughfif desired three only may be 'use'd, but-inthat case *in. order that one may beiab'ove the extended part of the shaft 8 none of themuwould be-immediately above" an-yiof:the 'supportingrol1ers' 2 as 'it is de-' sirable' for the: rollers to be equally spaced rollers' 3 and shaft at due to the addedten *sionof the chain or belt caused by the mate-- rialixto be ground fed'under'the roller and thereby increasing i slightly the distance between-' thehshaft 'cente'rsfi Other ineans' -for T p'ressi'ng"the rollers 3 to the'grinding ring 1 mayu'bewmployed, such as wire ropes 12 ipassi ng over or seeuredto the shafts iand connected to :weights "or springs -13 to give thedesired-tension. Turnbuckles 1e are preferablyiprovidedto a djustthe amount of this :eXtr-apressure and'a graduated scale may also: be '1 funnished to indicate the amount thereof Thewire ropesor the like 12 may" he-inclined to the yertical, sloping down from the shaft 4' in a. directionopposite to loo 7 that inwhich thea'djaeen't part of the ring =1 moves "(as shown"more'particularly in Fig. 5); 'In this' manner 'thewire ropes'or thef'like will also reducethetwistingstress on'the pivots "5' of the shafts 4.

The grinding machine described above may be used with any desired screening apparatus, but it is preferred to combine therei with a pneumatic separator as illustrated in Fig. l, for which purpose a vertical shaft 15 is stepped on the pedestal 6 and is driven by bevel gears 16 from a counter-shaft 1'7, itself rotated by band or the like from the shaft 8. The machine is inclosed by a dust proof casing 18 having a central conical feed opening or hopper 19 surrounding the shaft 15. A centrifugal spreader 20 is fixed on the shaft 15 and overlaps the fixed hopper 19, as shownat 21. The spreader 20 carries a fan 22 arranged near the upper part of the casing 18 around the hopper 19, and a conical or annular guide plate 23 extends from the fan downward toward the grinding ring 1. Another conical or annular guide plate 24 is secured to'the grinding ring 1 and surrounds the plate leaving an annular passage 25 between them. Surrounding theguide plate 241: is an annular channel 26 (supported by the casing 18) the inner side of which overlaps the guide plate 2 as shown at 27. a

The material to be'ground is fed into the hopper 19 by any convenient means such as by the conveyor screw 28 and, the machine being set in motion by power applied to the pulley 7, the material falling through the spreader 20 on to its base plate 29 will be delivered therefrom through the openings 30 by the centrifugal force developed on to the guide plate 23 and about the grinding rollers 3 whence it falls into the grinding ring 1 and will be ground therein under the rollers 3. Meanwhile a current of air will be set up within the casing 18 by the fan 22. This current, starting from the periphery of the fan will pass downward between the casing 18 and the guide plate 23, through the passage 25 to the grinding ring 1, and thence upward inside the guide plate 23 and through the fan 22. In its upward passage this current of air will carry all the finer particles of material being ground up into the fan 22 and as these particles issue from the periphery of the fan they will strike against the adjacent wall of the casing 18 and fall down into the channel 26 whence they may be removed by a scraper 31 attached to and revolving with the grinding ring 1 to be finally discharged at This discharge is preferably provided with an air seal in any known manner, as by a flexible sleeve 33, which with the ground material contained thereby and in the discharge will usually be sufiicient. The degree of fineness of the particles thus delivered will of course depend on the strength of the air current and with a given speed of revolution this may be varied by adjusting the position ofa damper 34 in the fan 22, such adjustment being effected by any desired means such as by supporting pegs 35 which may be placed in different holes 36 formed in the fan structure.

If desired, the air current may be assisted in its separation of the ground material by a surrounding screen, indicated in dotted lines at 37.

In order to prevent the current of air from circulating below the grinding ring 1 and totally to inclose the shafts and chain :1 casing 38 is secured to the central pedestal (3 extending toward the ring 1.

ventilating pipe 39 may, if desired, be arranged in the discharge outlet 32 leading to a dust chamber or to the atmosphere in order to take away any excess of air or dust.

As an alternative to the pneumatic separator described above the arrangement illustrated in Figs. 2 and 3 may be used, where the grinding ring 1 is surrounded by a screen 40 which may be stationary but is preferably fixed to the ring and rotates therewith. This screen extends above the grinding ring at a suitable angle and it will be seen that as successive portions of the circumference of the grinding rollers 3 leave the face of the ring 1 the material being treated will be lifted up by the centrifugal force developed and carried on to thescreen 4:0. The tailings will fall back into the hollow of the grinding ring 1 to pass under the rollers 3 again while the fines will pass through the screen on to the channel 26 surrounding the screen. In the construction illustrated this channel is stationary being formed on the casing 18 which incloses the machine and prevents dissipation of dust, or it may be separately made and suitably supported. A scraper or scoop 31 is fixed to the ring 1 and traveling therewith around the channel 26 carries the fines to the dis charge 32. As amodificationthe channel 26 may be fixed to the ring 1 the scraper 31 being stationary and fixed in proximity to the outlet 32. If desired the screen 10 may becaused to vibrate by any suitable means,

especially when it does not revolve with the ring 1.

What I claim and desire to secure by Letters Patent is i 1. 1m a grinding or crushing mill, the combination with a substantially horizontal grinding ring having a concaved upper face,

and means for rotating said ring, of grinding rollers rotatable on swiveling shafts and resting in the depression in the upper face of the grinding ring, and tension means acting on the swiveling shafts to vary the pres sure of the grinding rolls against the grinding ring, said means acting in a direction inclined to the vertical and opposite the direction of rotation of the adjacent portion of the grinding ring.

2. In a grinding or crushing mill, the combination of three or more supporting rollers, a substantially horizontal grinding ring supported directly and solely on said rollers, means for driving one of the supporting rollers to rotate the grinding ring including a shaft on which the supporting roller is mounted and that extends past the axis of the grinding ring, grinding rollers cooperating with the grinding ring, and connections between one of the grinding rollers and the section of the aforesaid driving shaft of the supporting roller that extends beyond the aXis of the grinding ring for positively rotating the grinding roller.

3. In a grinding or crushing mill, the combination with a grinding ring and coacting grinding rollers, of an inclosing casing, a guide plate dividing the interior of the casing above the grinding means into an inner and an outer chamber, an eXha-ustfan for creating a current of air from the inner to the outer chamber, a second guide plate eX- tending up from the periphery of the grinding ring and to a point above the lower edge of the first said guide plate, and separated from the first said plate by an annular space,

of the first said guide plate, a receptacle for ground material within the outer chamber of the casing adjacent the grinding ring and having its, inner wall extended over said sec ond guide plate into the space between the guide plates, and means for feeding material to be ground to the grinding ring.

In testimony whereof I have aflixed my signature in'presence of two witnesses.

ARTHUR HARRIMAN MOSS. Witnesses:

ARTHUR H. GREENWOOD, EDITH A. PORTEUS.

Copies of this patent may be obtained for five cents each, by addressing" the Commissioner of Patents,

Washington, D. 0. 

